Battery pack support portion configured to accommodate multiple different device interfaces

ABSTRACT

A battery pack that includes a battery pack housing. The battery pack housing includes a battery pack support portion that is configured to removably mechanically and electrically connect the battery pack to a device. The support portion includes a plurality of terminals for electrically connecting the battery pack to the device. The battery pack support portion includes a central recess. The battery pack support portion has a support portion length and a central recess length. The battery pack support portion is configured to receive a first device interface that electrically connects to a first subset of the plurality of terminals and is approximately the same length as the support portion length. The battery pack support portion is also configured to receive a second device interface that electrically connects to a second subset of the plurality of terminals and is approximately the same length as the central recess length.

FIELD

Embodiments described herein relate to a battery pack for powering a device.

SUMMARY

Embodiments described herein provide a battery pack that includes a battery pack housing. The battery pack housing includes a battery pack support portion that is configured to removably mechanically and electrically connect the battery pack to a device. The support portion includes a plurality of terminals for electrically connecting the battery pack to the device, and first and second rails for mechanically connecting the battery pack to the device. The battery pack support portion is configured to receive or accommodate multiple different device interfaces. The multiple different device interfaces correspond, for example, to high power devices, low power devices, or charging devices. Depending upon the type of device to which the battery pack is connected, the device interface that is received by the battery pack support portion can vary. The device interface, for example, can vary in size (e.g., length), terminal connections, and/or shape.

Embodiments described herein provide a battery pack including a housing, a plurality of battery cells located within the housing, a first battery pack terminal, and a second battery pack terminal. The housing includes a battery pack support portion configured to removably mechanically connect the battery pack to a first device and a second device. The battery pack support portion has a support portion length. The battery pack support portion includes a first rail, a second rail, and a coupling mechanism for securing the battery pack to the first device and the second device, and a central recess having a central recess length. The first battery pack terminal is configured to electrically connect the battery pack to an interface of the first device. The second battery pack terminal is configured to electrically connect the battery pack to an interface of the second device. The second battery pack terminal is accessible through the central recess of the battery pack support portion. The second battery pack terminal does not electrically connect to the interface of the first device, and the first battery pack terminal does not electrically connect to the interface of the second device.

In some embodiments, the first battery pack terminal is a first battery pack power terminal, and the second battery pack terminal is a second battery pack power terminal. In some embodiments, the first battery pack powered device requires a higher discharge current from the battery pack than the second battery pack powered device. In some embodiments, the battery pack further includes a third battery pack ground terminal configured to electrically connect the battery pack to the interface of the first device and the interface of the second device. In some embodiments, the battery pack further includes a fourth battery pack signal terminal configured to electrically connect the battery pack to the interface of the first device and the interface of the second device, the fourth battery pack signal terminal being for transmitting/receiving one of communication signal and temperature signal. In some embodiments, the fourth battery pack signal terminal is accessible through the central recess of the battery pack support portion. In some embodiments, the battery pack further includes a third battery pack signal terminal configured to electrically connect the battery pack to the interface of the second device, the third battery pack signal terminal is accessible through the central recess of the battery pack support portion. In some embodiments, the first battery pack power terminal and the second battery pack power terminal are spaced apart by a distance in the range of 30 mm to 33 mm. In some embodiments, the first battery pack power terminal and the third battery pack ground terminal are spaced apart by a distance in the range of 19 mm to 22 mm. In some embodiments, the second battery pack power terminal and the third battery pack ground terminal are spaced apart by a distance in the range of 10 mm to 13 mm. In some embodiments, the first battery pack power terminal and the fourth battery pack signal terminal are spaced apart by a distance in the range of 8 mm to 14 mm. In some embodiments, the first battery pack power terminal and the third battery pack signal terminal are spaced apart by a distance in the range of 17 mm to 23 mm.

Embodiments described herein provide a battery pack including a housing, a plurality of battery cells located within the housing, a first battery pack terminal, and a second battery pack terminal. The housing includes a battery pack support portion configured to removably mechanically connect the battery pack to a first device and a second device. The battery pack support portion has a support portion length. The battery pack support portion includes a central recess having a central recess length. The first battery pack terminal is configured to electrically connect the battery pack to an interface of the first device. The second battery pack terminal is configured to electrically connect the battery pack to an interface of the second device. The second battery pack terminal is accessible through the central recess of the battery pack support portion. The second battery pack terminal does not electrically connect to the interface of the first device, and the first battery pack terminal does not electrically connect to the interface of the second device.

In some embodiments, the first battery pack terminal is a first battery pack power terminal, and the second battery pack terminal is a second battery pack power terminal. In some embodiments, the first battery pack powered device requires a higher discharge current from the battery pack than the second battery pack powered device. In some embodiments, the battery pack further comprises a third battery pack ground terminal configured to electrically connect the battery pack to the interface of the first device and the interface of the second device. In some embodiments, the battery pack further comprises a fourth battery pack signal terminal configured to electrically connect the battery pack to the interface of the first device and the interface of the second device. In some embodiments, the fourth battery pack signal terminal is accessible through the central recess of the battery pack support portion. In some embodiments, the battery pack further comprises a third battery pack signal terminal configured to electrically connect the battery pack to the interface of the second device, the third battery pack signal terminal is accessible through the central recess of the battery pack support portion.

Embodiments described herein provide a system of battery pack powered devices including a first battery pack powered device including a first electrical interface, a second battery pack powered device including a second electrical interface, and a battery pack. The battery pack is configured to electrically connect to the first battery pack powered device through the first electrical interface and the second battery pack powered device through the second electrical interface. The battery pack includes a housing, a plurality of battery cells located within the housing, a first battery pack terminal, and a second battery pack terminal. The housing includes a battery pack support portion configured to removably mechanically connect the battery pack to the first device and the second device. The battery pack support portion has a support portion length. The battery pack support portion includes a first rail, a second rail, and a coupling mechanism for securing the battery pack to the first device and the second device. The battery pack support portion includes a central recess having a central recess length. The first battery pack terminal is configured to electrically connect the battery pack to the first electrical interface of the first device. The second battery pack terminal is configured to electrically connect the battery pack to the second electrical interface of the second device. The second battery pack terminal is accessible through the central recess of the battery pack support portion. The second battery pack terminal does not electrically connect to the first electrical interface of the first battery pack powered device, and the first battery pack terminal does not electrically connect to the second electrical interface of the second battery pack powered device.

In some embodiments, the first battery pack terminal is the first battery pack power terminal, and the second battery pack terminal is the second battery pack power terminal. In some embodiments, the first electrical interface of the first battery pack powered device has a first length, and the first length is approximately the same length as the support portion length. In some embodiments, the second electrical interface of the second battery pack powered device has a second length, and the second length is approximately the same length as the central recess length. In some embodiments, the first battery pack powered device requires a higher discharge current from the battery pack than the second battery pack powered device. In some embodiments, the second electrical interface of the second battery pack powered device has a second length, and the second length is approximately the same length as the support portion length. In some embodiments, the system further includes a third device including a third electrical interface, the battery pack configured to electrically connect to the third device through the third electrical interface. In some embodiments, the second battery pack power terminal is configured to electrically connect the battery pack to the third electrical interface of the third device, and the first battery pack power terminal does not electrically connect to the third electrical interface of the third device. In some embodiments, the third device is a battery pack charger.

Before any embodiments are explained in detail, it is to be understood that the embodiments are not limited in its application to the details of the configuration and arrangement of components set forth in the following description or illustrated in the accompanying drawings. The embodiments are capable of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising,” or “having” and variations thereof are meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless specified or limited otherwise, the terms “mounted,” “connected,” “supported,” and “coupled” and variations thereof are used broadly and encompass both direct and indirect mountings, connections, supports, and couplings.

In addition, it should be understood that embodiments may include hardware, software, and electronic components or modules that, for purposes of discussion, may be illustrated and described as if the majority of the components were implemented solely in hardware. However, one of ordinary skill in the art, and based on a reading of this detailed description, would recognize that, in at least one embodiment, the electronic-based aspects may be implemented in software (e.g., stored on non-transitory computer-readable medium) executable by one or more processing units, such as a microprocessor and/or application specific integrated circuits (“ASICs”). As such, it should be noted that a plurality of hardware and software based devices, as well as a plurality of different structural components, may be utilized to implement the embodiments. For example, “servers” and “computing devices” described in the specification can include one or more processing units, one or more computer-readable medium modules, one or more input/output interfaces, and various connections (e.g., a system bus) connecting the components.

Other aspects of the embodiments will become apparent by consideration of the detailed description and accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an electrical combination of a device and a battery pack for powering the device, according to embodiments described herein.

FIG. 2 is a perspective view of a battery pack, according to embodiments described herein.

FIG. 3 is a front view of the battery pack of FIG. 2.

FIG. 4 is a rear view of the battery pack of FIG. 2.

FIG. 5 is a top view of the battery pack of FIG. 2.

FIG. 6 is a bottom view of the battery pack of FIG. 2.

FIG. 7 is a right-side view of the battery pack of FIG. 2.

FIG. 8 is a rear-perspective view of the battery pack of FIG. 2.

FIG. 9 is a perspective view of a device that is configured to be powered by the battery pack of FIG. 2, according to embodiments described herein.

FIG. 10 is a bottom view of the device of FIG. 9.

FIGS. 11 and 12 illustrate a device interface for connecting the device of FIG. 10 to the battery pack of FIG. 2, according to embodiments described herein.

FIGS. 13 and 14 illustrate another device interface for connecting the device of FIG. 10 to the battery pack of FIG. 2, according to embodiments described herein.

FIGS. 15 and 16 illustrate another device interface for connecting the device of FIG. 10 to the battery pack of FIG. 2, according to embodiments described herein.

FIGS. 17 and 18 illustrate another device interface for connecting the device of FIG. 10 to the battery pack of FIG. 2, according to embodiments described herein.

FIG. 19 illustrates another device interface for connecting the device of FIG. 10 to the battery pack of FIG. 2, according to embodiments described herein.

DETAILED DESCRIPTION

Embodiments described herein provide a battery pack that includes a battery pack housing. The battery pack housing includes a battery pack support portion that is configured to removably mechanically and electrically connect the battery pack to a device. The support portion includes a plurality of terminals for electrically connecting the battery pack to the device, and first and second rails for mechanically connecting the battery pack to the device. The battery pack support portion includes a central recess. The battery pack support portion has a support portion length and a central recess length. The battery pack support portion is configured to receive a first device interface that electrically connects to a first subset of the plurality of terminals and is approximately the same length as the support portion length. The battery pack support portion is also configured to receive a second device interface that electrically connects to a second subset of the plurality of terminals and is approximately the same length as the central recess length.

FIG. 1 illustrates an electrical combination 100 of a device (e.g., a cordless, hand-held power tool) 200 and a battery pack 300. FIG. 2 illustrates the battery pack 300 that is connectable to and supportable by the cordless, hand-held power tool 200 or another battery pack powered device. For example, the battery pack 300 is configured to be connectable to a screwdriver, a drill driver, an impact driver, an impact wrench, a hammer drill, a jigsaw, a bolt cutter, an offset shear, a planar, a table saw, a miter saw, a grinder, a circular saw, a reciprocating saw, a rotary cutter, a scroll saw, a fan, a caulk gun, a drain auger, a hot glue gun, a transfer pump, a blower, a vacuum cleaner, a propane heater, a cement mixer, a sander, a router, a buffer, a nailer, a staple gun, a light, a speaker, a compressor, an inflator, etc.

As shown in FIGS. 2-8, the battery pack 300 includes a housing 305. The housing 305 includes a top housing portion 310 and a bottom housing portion 315. Although the battery pack 300 is illustrated in FIGS. 2-8 including the top housing portion 310 and the bottom housing portion 315, in some embodiments, the battery pack 300 includes a left housing portion and a right housing portion. The battery pack 300 also includes a support portion 320 for supporting the battery pack 300 on, and coupling the battery pack 300 to, a device such as the hand-held power tool 200. The support portion 320 includes a first rail 325 and a second rail 330 for slidably attaching the battery pack 300 to the device. The support portion 320 is connectable to a complementary support portion on the device (e.g., a battery pack receiving portion of a power tool). The battery pack 300 also includes a button 335 and a latch or coupling mechanism 340 for selectively coupling the battery pack 300 to, or releasing the battery pack 300 from, the device. In some embodiments, the button 335 and coupling mechanism 340 are considered to be included in the battery pack support portion 320.

The battery pack 300 includes a plurality of terminals within the support portion 320 that are operable to electrically connect one or more battery cells within the battery pack 300 to the device. As illustrated in FIG. 4, the plurality of terminals include a first terminal 345, a second terminal 350, a third terminal 355, a fourth terminal 360, and a fifth terminal 365. In some embodiments, the first terminal 345 is a battery negative terminal, the second terminal 350 is a temperature terminal, the third terminal 355 is a communication terminal, the fourth terminal 360 is a low power or charging terminal, and the fifth terminal 365 is a battery positive terminal. In some embodiments, the second terminal 350 is the communication terminal and the third terminal 355 is a bypass terminal for bypassing a current sensing circuit. Referring to FIGS. 4 and 5, the fifth terminal 365 and the fourth terminal 360 are spaced apart by a lateral separation L1. In some embodiments, the lateral separation L1 is between about 10 mm to about 13 mm (e.g., about 11.2 mm). The first terminal 345 and the fifth terminal 365 are spaced apart by a lateral separation L2. In some embodiments, the lateral separation L2 is between about 30 mm to about 33 mm (e.g., about 31.28 mm). The first terminal 345 and the fourth terminal 360 are spaced apart by a lateral separation L3. In some embodiments, the lateral separation L3 is between about 17 mm to about 33 mm (e.g., about 20.23 mm). The second (or third) terminal 350, 355 and the fifth terminal 365 are spaced apart by a lateral separation L4. In some embodiments, the lateral separation L4 is between about 19 mm to about 22 mm (e.g., about 20.23 mm).

The battery pack 300 is removably and interchangeably connected to a device, such as the hand-held power tool 200, to provide operational power to the device. The terminals 345, 350, 355, 360, and 365 are configured to mate with corresponding terminals extending from the device. The battery pack 300 substantially encloses and covers the terminals on the device when the pack 300 is positioned within a battery pack receiving portion of the device (i.e., the battery pack 300 functions as a cover for the opening and terminals of the device). Once the battery pack 300 is disconnected from the device, the terminals on the device are generally exposed to the surrounding environment. In this illustrated embodiment, the battery pack 300 is designed to substantially follow the contours of a hand-held power tool to match the general shape of an outer casing of a handle of the power tool 200, and the battery pack 300 generally increases (i.e., extends) the length of the grip of the power tool (e.g., a portion of the power tool below a motor).

As illustrated in FIG. 6, the bottom housing portion 315 of the housing 305 includes four fasteners 370 for fastening the bottom housing portion 315 to the top housing portion 310. For example, in some embodiments, the fasteners 370 are screws that extend vertically through apertures in the bottom housing portion 315 to engage a threaded aperture in the top housing portion 310. In other embodiments, the top housing portion 310 and the bottom housing portion 315 are fastened together in a different manner, such as using an adhesive or a fastener other than a screw.

With reference to FIG. 5, the support portion 320 is configured to accommodate device interfaces for a variety of different devices. For example, the device interfaces can vary based on which terminals (e.g., male terminals) are used to connect to the battery pack 300's terminals (e.g., female terminals). The interfaces can also vary in size. For example, the support portion 320 has a support portion length, L_(SP). A central recess 375 within the support portion 320 has a central recess length, L_(CR). In some embodiments, the central recess length, L_(CR), is between about 17 mm to about 20 mm (e.g., about 18.75 mm). In some embodiments, a device interface is approximately the same size as the support portion length, L_(SR). In some embodiments, the support portion length, L_(SP), is between about 43 mm to about 46 mm (e.g., about 44.48 mm). In other embodiments, a device interface is approximately the same size as the central recess length, L_(CR). Accordingly, the battery pack 300 is configured to accommodate device interfaces of different sizes.

FIGS. 9 and 10 illustrate the electrical combination 100 with the battery pack 300 removed (i.e., detached) from the device 200. The device 200 includes an interface 400 for electrically connecting to the battery pack 300. The interface 400 is illustrated in greater detail in FIGS. 11 and 12. The interface 400 includes an interface body 405, a first terminal 410, a second terminal 415, a third terminal 420, a fourth terminal 425, and a fifth terminal 430. The interface body 405 has an interface body length, L_(IB). A central portion of the interface body 405 has a central portion length, L_(CP). The interface body length, L1, is approximately equal to the support portion length, L_(SP), of the battery pack 300. The central portion length, L_(CP), is approximately equal to the central recess length, L_(CR), of the battery pack 300. Although the interface 400 is illustrated as including five terminals, in other embodiments, an interface for electrically connecting to the battery pack 300 includes fewer than five terminals (e.g., two terminals, three terminals, or four terminals). Each of the terminals 410-430 can be configured to provide a particular connection between the device 200 and the battery pack 300. As a result, each of the terminals 410-430 provides a dedicated function to the device 200 based on the type of device 200 that is being connected to the battery pack. For example, when the device 200 is a battery pack charger, the same terminal connections do not need to be used as when the device 200 is a cordless, hand-held power tool (e.g., a drill). As such, the five terminal embodiment illustrated in FIGS. 11 and 12 is shown for illustrative purposes and an interface for electrically connecting to the battery pack can include all or a subset of the five illustrated terminals 410-430.

For the interface 400 shown in FIGS. 11 and 12, the first terminal 410 is a battery pack negative power terminal, the second terminal 415 is a temperature terminal, the third terminal 420 is a communication terminal, the fourth terminal 425 is a charging terminal, and the fifth terminal 430 is a battery pack positive power terminal. In some embodiments, the fourth terminal 425 is also configured to operate as a low-power terminal. The fourth terminal 425 can be configured to provide charging current to the battery pack 300 when the device 200 is a battery pack charger. The fourth terminal 425 can be configured to receive power from the battery pack 300 when the device 200 is a low power device (e.g., a device requiring a comparatively low discharge current from the battery pack 300), such as a light, a fan, etc. In some embodiments, the second terminal 415 is configured as the communication terminal and the third terminal 420 is configured as a bypass terminal. In such embodiments, the bypass terminal 420 is configured to bypass, for example, a current sensing circuit. As a result, current sensing circuitry within the battery pack 300 can be avoided by the device 200 if the device 200 is configured to use the bypass terminal 420 instead of the battery pack negative power terminal 410.

When the third terminal 420 is configured as a bypass terminal, it is used, for example, by high current draw devices to prevent the battery pack 300 from unnecessarily shutting down the battery pack 300 due to high current, or from adding resistance (e.g., a current sensing resistor) to the battery pack 300's discharge circuit, which can limit the output current capability of the battery pack 300. In some embodiments, the interface 400 includes each of terminals 410-430, but one or more of the terminals 410-430 are non-functional or non-operational. For example, by including all of the terminals 410-430 in the interface 430, a more secure connection between the battery pack 300 and the device 200 can be achieved. In some embodiments, one or more of the terminals 410-430 in the interface 400 are not present, but the general shape of the interface body 405 remains substantially the same. As a result, the shape of the interface body helps to securely connect the interface 400 to the battery pack 300 in the absence of one or more of the terminals 410-430.

FIGS. 13 and 14 illustrate an interface 500 that includes an interface body 505, a first terminal 510, a second terminal 515, and a third terminal 520. The interface body 505 has an interface body length, L_(IB). A central portion of the interface body 505 has a central portion length, L_(CP). The interface body length, L_(IB), is approximately equal to the support portion length, L_(SP), of the battery pack 300. The central portion length, L_(CP), is approximately equal to the central recess length, L_(CR), of the battery pack 300. For the interface 500 shown in FIGS. 13 and 14, the first terminal 510 is a battery pack negative power terminal, the second terminal 515 is a communication terminal, and the third terminal 520 is a battery pack positive power terminal. The interface body 505 of the interface 500 is substantially the same shape as the interface body 405 for the interface 400. As described previously, the shape of the interface body helps to securely connect the interface 500 to the battery pack 300 in the absence of one or more terminals.

FIGS. 15 and 16 illustrate an interface 600 that includes an interface body 605, a first terminal 610, a second terminal 615, and a third terminal 620. The interface body 605 has an interface body length, L_(IB). A central portion of the interface body 605 has a central portion length, L_(CP). The interface body length, L_(IB), is approximately equal to the support portion length, L_(SP), of the battery pack 300. The central portion length, L_(CP), is approximately equal to the central recess length, L_(CR), of the battery pack 300. For the interface 600 shown in FIGS. 15 and 16, the first terminal 610 is a battery pack negative power terminal, the second terminal 615 is a communication terminal, and the third terminal 620 is a battery pack positive power terminal. The interface body 605 of the interface 600 is substantially the same shape as the interface body 405 and 505 for the interfaces 400 and 500, respectively. As described previously, the shape of the interface body helps to securely connect the interface 600 to the battery pack 300 in the absence of one or more terminals. In some embodiments, the interface 600 shown in FIGS. 15 and 16 corresponds to an charger interface for charging the battery pack 300. In other embodiments, the interface 600 shown in FIGS. 15 and 16 corresponds to a low power device 200 that includes communication capability (i.e., through the communication terminal 615).

FIGS. 17 and 18 illustrate an interface 700 that includes an interface body 705, a first terminal 710 and a second terminal 715. The interface body 705 has an interface body length, L_(IB). A central portion of the interface body 705 has a central portion length, L_(CP). The interface body length, L_(IB), is approximately equal to the support portion length, L_(SP), of the battery pack 300. The central portion length, L_(CP), is approximately equal to the central recess length, L_(CR), of the battery pack 300. For the interface 700 shown in FIGS. 17 and 18, the first terminal 710 is a battery pack negative power terminal, and the second terminal 715 is a battery pack positive power terminal. The interface body 705 of the interface 700 is substantially the same shape as the interface bodies 405, 505, and 605 for the interfaces 400, 500, and 600, respectively. As described previously, the shape of the interface body helps to securely connect the interface 700 to the battery pack 300 in the absence of one or more terminals. In some embodiments, the interface 700 shown in FIGS. 17 and 18 corresponds to a low power device 200 (e.g., a lamp, a fan, etc.) that requires only low discharge currents from the battery pack 300 and does not require communication capability.

FIG. 19 illustrates a modified interface body 720 for the interface 700. The shape of the modified interface body 720 is different from the shape of the interface body 705. For example, the interface body 705 (and interface bodies 405, 505, and 605) include a first lateral portion 725, a second lateral portion 730, and a central portion 735. The length of the interface body 705 including the portions 725, 730, and 735 is the interface body length, L_(IB), and is approximately the same length as the support portion length, L_(IB)SP, of the battery pack 300. Because the interface 700 of FIGS. 17 and 18 includes only the first terminal 710 and the second terminal 715, the lateral portions 725, 730 are not being used to support any terminals. As a result, the lateral portions 725, 730 of the interface body 705 can be removed. The result of removing the lateral portions 725, 730 from the interface body 705 is the modified interface body 720, which includes only the central portion 735 having the central portion length, L_(CP). The central portion length, L_(CP), is approximately the same length as the central recess length, L_(CR), of the battery pack 300 (see FIG. 5), such that the central recess 375 is configured to receive the central portion 735 of the interface 700. Accordingly, the battery pack 300 is configured to receive or accommodate device interfaces of different sizes, different shapes, and having different terminal configurations.

Thus, embodiments described herein provide, among other things, a battery pack that is configured to accommodate multiple different device interfaces. Various features and advantages are set forth in the following claims. 

What is claimed is:
 1. A battery pack comprising: a housing including a battery pack support portion configured to removably mechanically connect the battery pack to a first device and a second device, the battery pack support portion having a support portion length, the battery pack support portion including: a first rail, a second rail, and a coupling mechanism for securing the battery pack to the first device and the second device; and a central recess having a central recess length; a plurality of battery cells located within the housing; a first battery pack terminal configured to electrically connect the battery pack to an interface of the first device; and a second battery pack terminal configured to electrically connect the battery pack to an interface of the second device, the second battery pack terminal accessible through the central recess of the battery pack support portion, wherein the second battery pack terminal does not electrically connect to the interface of the first device, and wherein the first battery pack terminal does not electrically connect to the interface of the second device.
 2. The battery pack of claim 1, wherein the first battery pack powered device requires a higher discharge current from the battery pack than the second battery pack powered device.
 3. The battery pack of claim 1, further comprising a third battery pack terminal configured to electrically connect the battery pack to the interface of the first device and the interface of the second device.
 4. The battery pack of claim 3, further comprising a fourth battery pack terminal configured to electrically connect the battery pack to the interface of the first device and the interface of the second device.
 5. The battery pack of claim 4, wherein the fourth battery pack terminal is accessible through the central recess of the battery pack support portion.
 6. The battery pack of claim 1, further comprising a third battery pack terminal configured to electrically connect the battery pack to the interface of the second device, wherein the third battery pack terminal is accessible through the central recess of the battery pack support portion.
 7. A battery pack comprising: a housing including a battery pack support portion configured to removably mechanically connect the battery pack to a first device and a second device, the battery pack support portion having a support portion length, the battery pack support portion including a central recess having a central recess length; a plurality of battery cells located within the housing; a first battery pack terminal configured to electrically connect the battery pack to an interface of the first device; and a second battery pack terminal configured to electrically connect the battery pack to an interface of the second device, the second battery pack terminal accessible through the central recess of the battery pack support portion, wherein the second battery pack terminal does not electrically connect to the interface of the first device, and wherein the first battery pack terminal does not electrically connect to the interface of the second device.
 8. The battery pack of claim 7, wherein the first battery pack powered device requires a higher discharge current from the battery pack than the second battery pack powered device.
 9. The battery pack of claim 7, further comprising a third battery pack terminal configured to electrically connect the battery pack to the interface of the first device and the interface of the second device.
 10. The battery pack of claim 9, further comprising a fourth battery pack terminal configured to electrically connect the battery pack to the interface of the first device and the interface of the second device.
 11. The battery pack of claim 10, wherein the fourth battery pack terminal is accessible through the central recess of the battery pack support portion.
 12. The battery pack of claim 7, further comprising a third battery pack terminal configured to electrically connect the battery pack to the interface of the second device, wherein the third battery pack terminal is accessible through the central recess of the battery pack support portion.
 13. A system of battery pack powered devices, the system comprising: a first battery pack powered device including a first electrical interface; a second battery pack powered device including a second electrical interface; a battery pack configured to electrically connect to the first battery pack powered device through the first electrical interface and the second battery pack powered device through the second electrical interface, the battery pack including: a housing including a battery pack support portion configured to removably mechanically connect the battery pack to the first device and the second device, the battery pack support portion having a support portion length, the battery pack support portion including: a first rail, a second rail, and a coupling mechanism for securing the battery pack to the first device and the second device, and a central recess having a central recess length, a plurality of battery cells located within the housing, a first battery pack terminal configured to electrically connect the battery pack to the first electrical interface of the first device, and a second battery pack terminal configured to electrically connect the battery pack to the second electrical interface of the second device, the second battery pack terminal accessible through the central recess of the battery pack support portion, wherein the second battery pack terminal does not electrically connect to the first electrical interface of the first battery pack powered device, and wherein the first battery pack terminal does not electrically connect to the second electrical interface of the second battery pack powered device.
 14. The system of claim 13, wherein the first electrical interface of the first battery pack powered device has a first length, and the first length is approximately the same length as the support portion length.
 15. The system of claim 14, wherein the second electrical interface of the second battery pack powered device has a second length, and the second length is approximately the same length as the central recess length.
 16. The system of claim 15, wherein the first battery pack powered device requires a higher discharge current from the battery pack than the second battery pack powered device.
 17. The system of claim 14, wherein the second electrical interface of the second battery pack powered device has a second length, and the second length is approximately the same length as the support portion length.
 18. The system of claim 13, further comprising: a third device including a third electrical interface, the battery pack configured to electrically connect to the third device through the third electrical interface.
 19. The system of claim 18, wherein the second battery pack terminal is configured to electrically connect the battery pack to the third electrical interface of the third device; and wherein the first battery pack terminal does not electrically connect to the third electrical interface of the third device.
 20. The system of claim 19, wherein the third device is a battery pack charger. 